Baroque opera, thankfully, is flourishing at the Glimmerglass Festival. The willingness to stage operas from the century and a half before Mozart — Monteverdi, Handel, Purcell, Gluck, and Cavalli have all been featured since 1994 — is part of what brought the company to greater prominence.

The name of Jean-Baptiste Lully (1632-1687) was added to that list this year, with a sumptuously beautiful staging of Armide, heard Sunday afternoon, that was the high point of an otherwise mixed season. The production was imported from Toronto’s Opera Atelier and its fine Baroque ballet company, a smart decision for the realization of the ballet music, so crucial to the Lullian style.